The outer layer of the epidermis is known as what?

The outer layer of the epidermis is known as the stratum corneum. This layer serves as the first line of defense against environmental factors, such as pathogens and chemicals, as well as providing a barrier to prevent water loss from the body. The stratum corneum is composed largely of dead keratinized cells that are continuously shed and replaced, making it crucial for protecting the underlying layers of the skin. Its thickness can vary depending on the location on the body, with areas like the palms and soles having a thicker stratum corneum to withstand more friction and abrasion. This adaptation is essential for maintaining skin integrity and overall health.